Positive Electrode for Lithium Secondary Battery and Lithium Secondary Battery Including the Same

Abstract

The present disclosure provides a positive electrode for a secondary battery including a positive electrode active material layer formed on a surface of a positive electrode collector, wherein the positive electrode active material layer has a multilayer structure including a first positive electrode active material layer formed on the positive electrode collector and a second positive electrode active material layer formed on the first positive electrode active material layer, the first positive electrode active material layer includes a positive electrode active material, a first binder which is a melamine-based compound, and a second binder which is different from the melamine-based compound, and the second positive electrode active material layer includes a second positive electrode active material and the first binder which is a melamine-based compound, and provides a lithium secondary battery including the positive electrode for a secondary battery.

1 . A positive electrode for a secondary battery, the positive electrode comprising a positive electrode active material layer formed on a surface of a positive electrode collector,
 wherein the positive electrode active material layer has a multilayer structure including a first positive electrode active material layer formed on the positive electrode collector and a second positive electrode active material layer formed on the first positive electrode active material layer,   the first positive electrode active material layer comprises a first positive electrode active material, a first binder which is a melamine-based compound, and a second binder which is different from the melamine-based compound, and   the second positive electrode active material layer comprises a second positive electrode active material and the first binder which is a melamine-based compound.   
     
     
         2 . The positive electrode for a secondary battery of  claim 1 , wherein the melamine-based compound is a melamine acid salt. 
     
     
         3 . The positive electrode for a secondary battery of  claim 2 , wherein the melamine acid salt comprises melamine cyanurate. 
     
     
         4 . The positive electrode for a secondary battery of  claim 1 , wherein the first positive electrode active material layer comprises 1 to 30 parts by weight of the first binder which is a melamine-based compound and the second binder which is different from the melamine-based compound, with respect to 100 parts by weight of the first positive electrode active material. 
     
     
         5 . The positive electrode for a secondary battery of  claim 1 , wherein the first positive electrode active material layer comprises the first binder which is a melamine-based compound and the second binder which is different from the melamine-based compound in a weight ratio of 0.5:1 to 10:1. 
     
     
         6 . The positive electrode for a secondary battery of  claim 1 , wherein the second binder comprises a polyimide-imide, a polyvinylidene fluoride, or a combination thereof. 
     
     
         7 . The positive electrode for a secondary battery of  claim 1 , wherein the second positive electrode active material layer comprises 1 to 30 parts by weight of the first binder with respect to 100 parts by weight of the second positive electrode active material. 
     
     
         8 . The positive electrode for a secondary battery of  claim 1 , wherein the first positive electrode active material layer and the second positive electrode active material layer have a thickness ratio of 5:95 to 50:50. 
     
     
         9 . A lithium secondary battery comprising the positive electrode according to  claim 1 .